Free fall: A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is if air resistance is negligible. The time when the ball strikes the ground is closest to
A) 9.4 s
B) 9.0 s
C) 8.7 s
D) 9.7 s
E) 10 s

Question

Free fall: A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is  if air resistance is negligible. The time when the ball strikes the ground is closest to
A) 9.4 s 
B) 9.0 s 
C) 8.7 s 
D) 9.7 s 
E) 10 s

Quizplus · Accepted Answer

The Answer of Free fall: A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is  if air resistance is negligible. The time when the ball strikes the ground is closest to
A) 9.4 s 
B) 9.0 s 
C) 8.7 s 
D) 9.7 s 
E) 10 s

Free Fall: a Ball Is Projected Upward at Time T